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Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

  1. Sticky Thread Sticky: Forum Guidelines: Smart posting behavior pays off

    Welcome to talkstats.com, the place for statistics help. This is a guideline for people who want to ask a question on this forum and value a...

    Started by TheEcologist‎, 11-27-2010 12:13 PM
    • Replies: 1
    • Views: 197,032
    07-16-2014, 11:01 AM Go to last post
  2. Arrow Sticky Thread Sticky: We only provide homework help to those who show effort

    Welcome to Talk Stats Forum. In order to keep homework help effective and efficient, we request all members to abide by these guidelines: 1)...

    Started by quark‎, 09-30-2005 09:44 AM
    • Replies: 0
    • Views: 66,893
    09-30-2005, 09:44 AM Go to last post
  1. Maximum Likelihood estimator

    If X_1,X_2,....,X_n is a random sample with density f(x;\theta )=\frac{(x+1)}{\theta(\theta+1)}e^{\frac{-x}{\theta}}I_{(0,\infty)}(x),\theta>0 ...

    Started by askazy‎, 03-18-2015 05:19 PM
    • Replies: 4
    • Views: 1,577
    03-19-2015, 10:34 AM Go to last post
  2. STATS 311 HW Help

    An aircraft identification system is able to decide whether an aircraft entering the airspace is a friend or an intruder correctly 98% of the time....

    Started by biggoofy‎, 03-19-2015 07:53 AM
    • Replies: 1
    • Views: 816
    03-19-2015, 08:15 AM Go to last post
  3. Estimator

    Find the maximum likelihood estimator of f(x/\theta)=\theta(\theta +1)x^{\theta -1}(1-x)I_{}(x),\theta>0 ...

    Started by askazy‎, 03-19-2015 07:21 AM
    • Replies: 3
    • Views: 1,196
    03-19-2015, 07:46 AM Go to last post
  4. Am I using the right tests for my data set (correlation, multiple regression, ANCOVA)

    So I'm doing a study where I'm looking at what foraging habitats different fish associate with. I'm interested in seeing if foraging surface (i.e....

    Started by srpang89‎, 03-19-2015 12:41 AM
    • Replies: 3
    • Views: 1,729
    03-19-2015, 07:35 AM Go to last post
  5. Why are these statements false?

    Hello, I was doing a practice test and I got two questions wrong. The answer key said that these two statements were false: As sample size...

    Started by emilybatman‎, 03-19-2015 12:40 AM
    false, help me!, normal curve, sample distribution, standard deviation
    • Replies: 1
    • Views: 1,263
    03-19-2015, 02:39 AM Go to last post
  6. ANOVA and P-value

    I have a linear regression with an ANOVA table with F(4,8) = 2.763 Regression: 4 df Residual: 8 df F Statistic: 2.763 Significance: .103 ...

    Started by larrywallace‎, 03-18-2015 02:20 PM
    • Replies: 1
    • Views: 1,353
    03-18-2015, 02:39 PM Go to last post
  7. Post Question regarding statistical analyses of a trial

    I am a college student currently doing a seminar presentation on a drug's effects on insomnia. I am currently looking at trials, and one of the tools...

    Started by rayjay78‎, 03-18-2015 01:48 PM
    • Replies: 1
    • Views: 1,389
    03-18-2015, 02:16 PM Go to last post
  8. Upper limit for a distribution

    Hi, I needed help for something I've been trying to figure out on my own: the standard deviation and mean for GPA at my college. I was able to...

    Started by chubybuny‎, 03-16-2015 10:39 PM
    • Replies: 3
    • Views: 1,229
    03-18-2015, 08:36 AM Go to last post
  9. ANOVA analysis based on a mixture of within subject and between subject design?

    I have finished an experiment, and I used a mixture of within subject and between subject design, I am wondering if there is a specific name for this...

    Started by leochou1991‎, 03-18-2015 08:23 AM
    anova, between-subject, within-subject
    • Replies: 0
    • Views: 1,038
    03-18-2015, 08:23 AM Go to last post
  10. How to Calculate Confidence Intervals for Proportions - Quick response appreciated!

    I would like to calculate the 95% confidence intervals (CI) for the percentage of a sample who have an anxiety disorder. For example, if 20...

    Started by bozatron‎, 03-18-2015 04:58 AM
    • Replies: 2
    • Views: 1,024
    03-18-2015, 07:04 AM Go to last post
  11. Question Questions about the standard error

    SAMPLES The sample mean is an estimate of the population mean. And, the standard error (SE) of the sample mean -- s/SQRT(n) -- is a measure of...

    Started by DrAnthonyRodriguez‎, 03-18-2015 06:27 AM
    standard error
    • Replies: 0
    • Views: 833
    03-18-2015, 06:27 AM Go to last post
  12. Maximum Likelihood estimator

    If X_1,X_2,....,X_n is a random sample of X with density f(x;\theta)=\frac{\theta}{x^2}I_{ i)Find the estimator of moments and discuss its...

    Started by askazy‎, 03-17-2015 09:35 AM
    • Replies: 8
    • Views: 1,987
    03-17-2015, 04:41 PM Go to last post
  13. Hypothesis when seeking no differences

    Hi everyone, and thanks in advance for any help that is offered. I am working on my dissertation proposal and hit a bit of a wall when deciding...

    Started by ajr237‎, 03-11-2015 11:49 AM
    2 Pages
    1 2
    • Replies: 17
    • Views: 3,457
    03-17-2015, 03:00 PM Go to last post
  14. Help analysing percentage change and arcsine

    I'm doing a project at the moment and am currently looking at the percentage change. In order to test it statistically, I have been told I need to...

    Started by ChrisUk‎, 03-17-2015 02:36 PM
    • Replies: 0
    • Views: 2,145
    03-17-2015, 02:36 PM Go to last post
  15. Non parametric equivilent to ANCOVA

    Is there a non parametric test equivilent to an ANCOVA?

    Started by Savvy‎, 05-14-2008 01:48 AM
    • Replies: 5
    • Views: 22,477
    03-17-2015, 12:54 PM Go to last post
  16. Need Help with an ANOVA test

    Hi All I work in manufacturing and I am trying to compare 3 different teams in terms of their time taken to complete a changeover of equipment. I...

    Started by xbarcrawl‎, 03-11-2015 10:48 AM
    • Replies: 8
    • Views: 2,866
    03-17-2015, 12:19 PM Go to last post
  17. Failure to understand hypothesis testing data reqs

    Hi, I'm new to hypothesis testing so please go easy on me..... I'm having trouble understanding the data requirements for hypothesis testing. I...

    Started by hermain‎, 03-17-2015 12:06 PM
    • Replies: 0
    • Views: 935
    03-17-2015, 12:06 PM Go to last post
  18. [Multivariate analysis] Interest in each response variable separately

    Hei everyone I have a fully crossed experiment with three factors (Season, Infection, Starvation) and for each combination I measure gene...

    Started by tateblack‎, 03-17-2015 10:42 AM
    • Replies: 0
    • Views: 1,095
    03-17-2015, 10:42 AM Go to last post
  19. Better idea than to use Excel 6th degree polynoma for curve fitting

    I have non-linear data for children aged 0-18 years, 1 per year, and would like to fit a curve to the data from which I'll calculate reference values...

    Started by EpicEric‎, 03-17-2015 05:33 AM
    • Replies: 0
    • Views: 1,229
    03-17-2015, 05:33 AM Go to last post
  20. Regression vs Correlation dont understand

    Can any one explain the difference between regression and correlation in simple terms. Doing my homework rn worth 10 points. I dont know which...

    Started by silentdogood‎, 03-17-2015 01:15 AM
    • Replies: 3
    • Views: 1,543
    03-17-2015, 01:59 AM Go to last post
  21. Confusion on Normal distribtuion combinations

    Two large retail giant stores A & B price a brand of milk powder in such a way that A's price X follows N(50, 3^2) while B's price Y follows N(46,...

    Started by xenovia‎, 03-16-2015 08:37 AM
    • Replies: 3
    • Views: 1,230
    03-17-2015, 12:08 AM Go to last post
  22. Repeated measures ANOVA vs. something else??

    Hi, there. A group of us are interested in examining if there is consistency in the 'academic' rigor in a particular course offered at a school. ...

    Started by snipe001‎, 03-15-2015 09:55 AM
    • Replies: 2
    • Views: 1,020
    03-16-2015, 05:53 PM Go to last post
  23. [SPSS] Comparing groups: variances are not equal

    Hi, I have a data set which is normally distributed but the variances are not equal. I did transformation but this not work. which kind of test I...

    Started by Aphid‎, 03-15-2015 04:59 AM
    • Replies: 3
    • Views: 1,677
    03-16-2015, 06:36 AM Go to last post
  24. F-stat and F-critical difference

    Does it matter the difference in the F stat and the F critical? In other words, my F stat is 58.9 and the F critical is 4.19. That means the null...

    Started by kf_123‎, 03-14-2015 10:32 PM
    • Replies: 1
    • Views: 1,381
    03-15-2015, 12:47 PM Go to last post
  25. ANOVA in SPSS

    Hello all! I have a population of 76 students, separated into 3 sample groups (all differing in quantity) based on the factor (self-regulation). I...

    Started by kf_123‎, 03-15-2015 09:08 AM
    • Replies: 0
    • Views: 1,199
    03-15-2015, 09:08 AM Go to last post
  26. Multiple Mediation Model using INDIRECT Macro Vs. Amos - different results!

    Hi, I have a multiple mediation model with 1 IV, 6 mediators, and 1 DV (all are continuous variables). I also have one covariate to control for. I...

    Started by beaslyrising‎, 03-14-2015 06:18 PM
    amos, indirect, macro, mediation, results
    • Replies: 0
    • Views: 1,500
    03-14-2015, 06:18 PM Go to last post
  27. Statistical Difference vs. Norm

    Hello, I would appreciate your help with something. I have a study to test an advertisement of n=150. The results are given as percentages for...

    Started by Westermeister‎, 03-11-2015 07:46 AM
    market research, norm, significance, statistical difference
    • Replies: 10
    • Views: 2,310
    03-14-2015, 04:35 PM Go to last post
  28. t-test

    Hello all, I am trying to run a t-test on small data. I have 2 groups of 5 cases each. The mean of group 1 is 34 and in group 2 is 12. The...

    Started by Yankel‎, 03-14-2015 03:11 AM
    • Replies: 0
    • Views: 1,356
    03-14-2015, 03:11 AM Go to last post
  29. Creating a Forest Plot for Prevalence Studies in SPSS

    Hi All, I need to create a forest plot for my literature review on prevalence, and was wondering if any one has any experience creating one in...

    Started by bozatron‎, 03-13-2015 10:56 PM
    • Replies: 0
    • Views: 2,707
    03-13-2015, 10:56 PM Go to last post
  30. Error bars don't overlap but aren't significantly diff. - interpretations/reasons?

    Hello all, I'm struggling to understand/interpret my graph and kruskal wallis test. Basically, I've created a bar graph which looks pretty good....

    Started by Emilemmo‎, 03-13-2015 04:31 PM
    error bars, kruskal wallis, non-parametric test, overlap, significance
    • Replies: 5
    • Views: 2,270
    03-13-2015, 10:27 PM Go to last post
  31. Calculate average for irregular time series

    Hello I have irregular time series because only data changes are stored. So all data is available. I would like to calculate a time weighted...

    Started by JohnMeier‎, 03-13-2015 02:24 PM
    • Replies: 0
    • Views: 1,215
    03-13-2015, 02:24 PM Go to last post
  32. Hypergeometric distribution

    Hi, I hope you can help, i have an assignment i can not solve: You proffessor in sample theory think that their is 400 students 2 years ago,...

    Started by ferdinand2020‎, 03-13-2015 12:49 PM
    hypergeometric, issue, sample theory, statistics
    • Replies: 2
    • Views: 1,270
    03-13-2015, 02:00 PM Go to last post
  33. Name of proportion scaling by group

    I sometimes use a for of scaling where I split the data i=by a grouping variable and weight by 1/n for that group. I'll show it below. 2 questions:...

    Started by trinker‎, 03-13-2015 09:59 AM
    • Replies: 0
    • Views: 940
    03-13-2015, 09:59 AM Go to last post
  34. Question Correct statistical test to use for my data...

    Hello everyone, Potentially a silly question (but I am new to all of this): I have collected data from a focal animal study on Naked mole-rats....

    Started by Naked.Mole.Rat‎, 03-13-2015 06:33 AM
    • Replies: 0
    • Views: 946
    03-13-2015, 06:33 AM Go to last post
  35. Question Is it correct to use chi-square test here? Quick reply highly appreciated!

    Dear colleagues, very quick and brief advice is highly appreciated! I am about to finish work and have only one hesitation. Situation: 1) In...

    Started by wellfor‎, 03-13-2015 03:01 AM
    chi-square help
    • Replies: 3
    • Views: 1,487
    03-13-2015, 06:03 AM Go to last post
  36. Testing the Linearity assumption of a Linear Regression

    Hi, I am studying a final year psychology statistics and research methods course. As part of this we have to complete online quizzes. I'm having a...

    Started by Timbo‎, 03-12-2015 06:48 AM
    • Replies: 2
    • Views: 1,913
    03-12-2015, 05:06 PM Go to last post
  37. Question how to build the contingency table

    Hi all, I have two lists of genes as follows: DEList has 282 gene names AllList has 32805 gene names DEList is a subset of...

    Started by frymor‎, 03-12-2015 08:07 AM
    • Replies: 0
    • Views: 1,027
    03-12-2015, 08:07 AM Go to last post
  38. Question Bayes Estimator under quadratic loss function

    Let X,\theta be two random variables with a joint distribution, and \mu(\theta)=E. Suppose we have n observations on X given \theta, with the further...

    Started by MathJack‎, 03-10-2015 05:43 PM
    bayes estimation, statistical theory
    • Replies: 1
    • Views: 1,796
    03-11-2015, 09:01 PM Go to last post
  39. Correlation between variables or factors?

    Hi All, My independent variable consists of two factors (scales) and the dependent variable is the same (two factors or two scales). The factors...

    Started by masyuti‎, 03-11-2015 07:57 PM
    • Replies: 0
    • Views: 1,007
    03-11-2015, 07:57 PM Go to last post
  40. T-stat and Sign test

    Hi folks just looking for a quick bit of advice, I am conducting an event study on how the news announcements of macro economic indicators may...

    Started by jamiemcd93‎, 03-11-2015 10:18 AM
    • Replies: 2
    • Views: 1,649
    03-11-2015, 03:17 PM Go to last post
  41. Quick Question on Hypothesis Testing

    Let's say you test hypothesis at alpha=.05, does that mean that 5% of your rejections will be wrong? Is this statement true? If not, can you give...

    Started by icecream12345‎, 03-10-2015 11:52 PM
    alpha, hypothesis testing, significance level, type 1 error
    • Replies: 5
    • Views: 1,782
    03-11-2015, 02:35 PM Go to last post
  42. Help sample size

    Hello friends, I like to know how to calculate this and any help you can give, I will be very grateful. I interested to know to design a...

    Started by Pammy‎, 02-28-2015 01:32 PM
    • Replies: 1
    • Views: 2,150
    03-11-2015, 11:30 AM Go to last post
  43. Need real data set

    Hi, I have to find a real data set (can not be from a book) to perform discriminant analysis, manova, PCA, and a few other tests. It should not...

    Started by darkdream‎, 03-07-2015 08:33 PM
    • Replies: 1
    • Views: 1,930
    03-11-2015, 10:55 AM Go to last post
  44. Statistics Value Regression Question

    I need help with this question! The graph is in the picture below! A popular, nationwide standardized test taken by high-school juniors and...

    Started by zolton5971‎, 03-04-2015 03:51 PM
    • Replies: 1
    • Views: 1,480
    03-11-2015, 09:07 AM Go to last post
  45. Unhappy Sampling Distribution Models - Homework question

    The question is: In a really large bag of M&Ms, the students in Exercise 8 found 500 candies, and 12% of them were green. Is this an unusually...

    Started by crimpingcatlady‎, 03-10-2015 03:47 PM
    • Replies: 1
    • Views: 2,080
    03-11-2015, 08:56 AM Go to last post
  46. Identifying the significant properties

    Hello, I have a problem in linguistic, and I believe statistics is what can help me solve it, but I don't know how. I have a list of vowels...

    Started by kamil-s‎, 03-11-2015 03:28 AM
    • Replies: 0
    • Views: 1,082
    03-11-2015, 03:28 AM Go to last post
  47. New SPSS user

    I am new to SPSS and the data input is a little confusing. For instance, i have a rating scale used by 3 students, daily over 6 weeks. the rating...

    Started by raay‎, 03-11-2015 02:13 AM
    • Replies: 1
    • Views: 864
    03-11-2015, 03:23 AM Go to last post
  48. Question Can I use all correlation metrics also for time series?

    I was using the cross correlation function in R (ccf) until now to discover correlations and lags between two time series. I was wondering if I...

    Started by JohnMeier‎, 03-09-2015 04:09 PM
    correlation, cross-correlation, nominal data, time-series
    • Replies: 3
    • Views: 1,370
    03-10-2015, 01:54 PM Go to last post
  49. Calculating Sample Size - Determining Sampling Plan

    Hi All, I need some help to determine the best method to go about setting up a sampling plan of some sort. Here is the situation... our business...

    Started by ammosman‎, 03-10-2015 08:00 AM
    • Replies: 2
    • Views: 1,373
    03-10-2015, 08:23 AM Go to last post
  50. Inter rater reliability

    Question: There are 2 raters. Each raters rates a person twice. The raters rates 0 or 1. I would like to see the inter rater reliability...

    Started by psoas‎, 03-09-2015 06:16 PM
    • Replies: 0
    • Views: 1,085
    03-09-2015, 06:16 PM Go to last post
  51. Mean and variance

    Hello, I have a question, I think it's not solvable, maybe I miss something... "A set of 10 numbers is given. The mean of the group is 10, and the...

    Started by Yankel‎, 03-08-2015 01:29 PM
    • Replies: 4
    • Views: 1,913
    03-09-2015, 04:00 PM Go to last post
  52. List of Countries by External Debt Statistics

    United States holds the first place followed by United Kingdom and France in external debt

    Started by Lenora‎, 03-09-2015 08:58 AM
    external debt, statistics, statsmonkey, world
    • Replies: 0
    • Views: 1,349
    03-09-2015, 08:58 AM Go to last post
  53. Power Regression

    I am taking a course at a local community college and experiencing problems understanding the concepts. Attached is the initial problem. I am...

    Started by rmendolsohn‎, 03-09-2015 07:07 AM
    • Replies: 0
    • Views: 1,246
    03-09-2015, 07:07 AM Go to last post
  54. Estimated mean response

    I would like to know how to write down the estimate mean response when doing a multiple regression. I know what the standard mean response is, see...

    Started by Artreides‎, 03-03-2015 05:26 AM
    • Replies: 3
    • Views: 1,634
    03-09-2015, 03:52 AM Go to last post
  55. Distribution/Sampling for Defects. HELP!

    I'm working on a project and the question is, "Company X no longer wants to check all of the items for a defect, can a sample be taken? If so what...

    Started by kess28‎, 03-08-2015 12:36 PM
    • Replies: 0
    • Views: 2,258
    03-08-2015, 12:36 PM Go to last post
  56. Question difference between differences!

    Dear all, I'm asking your help for solving the following - likely trivial - problem: I have 3 means (w/ relative st dev). Let's call them A, B,...

    Started by duende‎, 03-08-2015 04:03 AM
    • Replies: 0
    • Views: 1,036
    03-08-2015, 04:03 AM Go to last post
  57. Clinical Trials: Recommended Reading

    I was wondering if anyone could recommend some literature - online or otherwise - regarding the statistical procedures and considerations involved in...

    Started by A_Inc‎, 03-06-2015 07:49 AM
    • Replies: 2
    • Views: 1,530
    03-08-2015, 03:42 AM Go to last post
  58. Time Series Forecast Question - Weekly Sparse Data with Variable Starting Point

    Hi Folks, I am working on building a time series forecast model for a problem which involves dataset of manufacturers and their product offerings...

    Started by Skpatel‎, 03-07-2015 04:38 PM
    time series forecast
    • Replies: 0
    • Views: 1,245
    03-07-2015, 04:38 PM Go to last post
  59. Uniforming data to produce better graph

    Hello, forum! This is my first post here and I really hope someone can help me. I have to draw a graph of two very long columns of data. Both...

    Started by 41310602613‎, 03-07-2015 02:42 PM
    • Replies: 0
    • Views: 1,186
    03-07-2015, 02:42 PM Go to last post
  60. Cool Analytical flow, correlation research

    Hi Stat's experts. For my Experiment which I classified as Correlational research I will look for relations to Breathing pattern disorders (BPD)....

    Started by ohdear‎, 03-07-2015 05:22 AM
    correlation research, stat's experts
    • Replies: 0
    • Views: 949
    03-07-2015, 05:22 AM Go to last post

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